Stitch length adjusting structure of sewing machine

Abstract

The invention provides a stitch length adjusting structure of a sewing machine, and belongs to the technical field of sewing machines. The structure solves the technical problem that manual stitch length adjustment of the sewing machine is troublesome. The sewing machine comprises a machine shell, and a main shaft and a differential shaft are arranged in the machine shell. The stitch length adjusting structure comprises a stepping motor and an adjusting shaft, and an eccentric wheel is fixedly arranged on an output shaft of the stepping motor; the eccentric wheel and the adjusting shaft are connected through a motor connecting rod, and the eccentric wheel can drive the adjusting shaft to rotate and swing; an adjusting crank is fixedly arranged on the adjusting shaft, and a connecting rod pin is arranged on one side of the adjusting crank; the main shaft is connected with the connecting rod pin through an eccentric connecting rod, the differential shaft is connected with the connectingrod pin through a differential connecting rod, and a stitch length shaft rod is further arranged on the connecting rod pin; one end of the stitch length shaft rod sleeves the connecting rod pin, and the other end of the stitch length shaft rod is hinged to the adjusting crank. According to the stitch length adjusting structure, the stepping motor cooperates with the eccentric wheel, so that electronic adjustment of the stitch length of the sewing machine is realized, and the convenience and accuracy of stitch length adjustment of the sewing machine are improved.

Description

technical field [0001] The invention belongs to the technical field of sewing machines, and relates to a stitch length adjusting structure of a sewing machine. Background technique [0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing materials; the sewing machine can sew cotton, hemp, silk, wool , rayon and other fabrics and leather, plastic, paper and other products, the stitches are neat and beautiful, smooth and firm, the sewing speed is fast, and the use is easy. According to different fabrics and actual needs, it is often necessary to adjust the stitch distance to make the sewing The effect is better, and the existing sewing machines on the market generally adjust the stitch size by hand. [0003] my country's patent (notification number: CN101168888; announcement date: 2008-04-30) discloses a stitch length adjustment mechanism for sewing machine...

AI Technical Summary

Problems solved by technology

[0004] The needle pitch adjustment mechanism of the sewing machine disclosed in the above-mentioned patent documents realizes the mutual conversion between the large and small stitch pitch adjustment devices through the drive of the reverse stitch dense needle cylinder, but it is desired to adjust the needle pitch in the large stitch pitch adjustment device or the small stitch pitch adjustment device. The size of the stitch length still needs to be adjusted manually, and the adjustment of the stitch length is still troublesome

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